2013 Caprice 1100 RPM idle
Posted: Mon Aug 10, 2020 4:22 pm
I have a '13 PPV that has an occasional high idle problem, it sometimes wants to idle at 1100 RPM. It always seems to happen when the car is warm or hot, never on a cold start. I can sometimes get it to go back to a normal idle of 650-700 RPM by turning the car off and restarting it. It was happening today so I tried to narrow it down, what seemed to work was turning off the car, opening the door and waiting about 30 seconds before restarting. This makes me think it is not a mechanical problem, but something in the tune. I'm guessing there is a set of parameters that make the PCM will command a high idle and one of them is the engine run time, turning off the car and opening the door "resets" one of the parameters and fixes the idle.
There are no codes or check engine lights. I can see the commanded idle in HP Tuners is set to 1096 RPM or very similar, close to 1100 but not exactly. This also makes me think it is not a mechanical problem but an electronic one. I have found aftermarket idle controllers for emergency vehicles but since the PCM is commanding the idle at 1100 I am assuming it isn't an aftermarket device. Has anyone else run into this? I've searched and not found much.
There are no codes or check engine lights. I can see the commanded idle in HP Tuners is set to 1096 RPM or very similar, close to 1100 but not exactly. This also makes me think it is not a mechanical problem but an electronic one. I have found aftermarket idle controllers for emergency vehicles but since the PCM is commanding the idle at 1100 I am assuming it isn't an aftermarket device. Has anyone else run into this? I've searched and not found much.